layer  specifies one or more layer(s) to apply the viewport-specific lineweight
can be :
1. name  (string)  the name of 1 layer
2. ename  (ename)  the entity name of the layer
3. enameList  (list of name | ename)  list of 1 or more layer entity string names and/or enames

viewport  specifies one or more viewport
can be
1. ename  (ename) the viewport's entity name
2. cvport  (integer)  the viewport's CVPORT viewport number
3. (list ename cvport ...)  list ename(s) and/or cvport(s)

lineweight  (integer)  the lineweight value to be assigned; if NIL, any lineweight override is removed
can be (symbolic name = integer value)
acLnWt000 = 0
acLnWt005 = 5
acLnWt009 = 9
acLnWt013 = 13
acLnWt015 = 15
acLnWt018 = 18
acLnWt020 = 20
acLnWt025 = 25
acLnWt030 = 30
acLnWt035 = 35
acLnWt040 = 40
acLnWt050 = 50
acLnWt053 = 53
acLnWt060 = 60
acLnWt070 = 70
acLnWt080 = 80
acLnWt090 = 90
acLnWt100 = 100
acLnWt106 = 106
acLnWt120 = 120
acLnWt140 = 140
acLnWt158 = 158
acLnWt200 = 200
acLnWt211 = 211
acLnWtByLayer = -1
acLnWtByBlock = -2
acLnWtByLwDefault = -3